? Cylinder lock with stainless steel body. ? Interchangeable Cylinder Lock ? Cylinder can be changed by using change key MD-K1. Easy to replace cylinder in case key is lost. ? Up to 7,800 key changes available. (750 key changes per master key.) ? Cylinder housing Diameter: 22 mm (7/8") ? 2 mm (5/64") plastic distance plate 6810-SP available for various door thickness. See P.581 * Cylinder housing only. Interchangeable Cylinder MD-N1 must be ordered for a complete assembly